Post - IBM TotalStorage 300 Service Manual

Diagnostics LED panel
The following illustration shows the LEDs on the diagnostics panel on the system
board. See "Light path diagnostics table" for information on identifying problems
using these LEDs.
Note: You need to remove the top cover (see "Removing the cover and bezel" on
Light path diagnostics table
The System Error LED on the operator information panel is On when certain system
errors occur. If the System Error LED is On, use the following table to help
determine the cause of the error and the action to take. See table in "Information
panel system error LED" on page 48.

POST

When you power-on the engine, it performs a series of tests to check the operation
of its components and some of the options installed in the engine. This series of
tests is called the power-on self-test or POST.
If POST finishes without detecting any problems, one long beep and three short
beeps sound.
If POST detects a problem, a series of beeps sound. See "Beep symptoms" on
page 45 and "POST error messages" on page 17 for more information.
Notes:
1. If you have a power-on password or administrator password set, you must type
2. A single problem might cause several error messages. When this occurs, work
16
IBM NAS 300 Service Guide
page 70) to view these LEDs.
the password and press Enter, when prompted, before POST will continue.
to correct the cause of the first error message. After you correct the cause of
the first error message, the other error messages usually will not occur the next
time you run the test.
PS1
PS2
PS3
NON
OVER
NMI
TEMP
FAN
MEM
CPU
PCI A
PCI B
VRM
DASD1
DASD2